Thermodynamics - 7-12 Isentropic Efficiency example 1

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[@grandlong5462]

I finally know where the h2s came from. Thank you very much!

[@dottosebastianophilipo2693]

Congratulation for solving well this problem Much respect from TANZANIA 🇹🇿🇹🇿

[@kerenhappuch5605]

tanzania oyee

[@duakhan5882]

Why are the actual and isentropic pressures the same?

[@yolo3004]

same question

[@sunmichoi6888]

Thank you so much!

[@zaynmoaaz8504]

[@Jack-nv3to]

Thank you for this wonderful course. Quick question: I think we should not use the actual Work (2000KW) to get actual flow rate. Should use Isentropic Work.

[@deyardeyar8163]

Dear Doctor, why S1 was equal to S2s and not S2a?

[@engineeringdeciphered]

Because S2s is the entropy if the process was isentropic. So it makes sense that if it was isentropic S2s would be the same as at the beginning, S1. The actual entropy is S2a and since it’s not really isentropic S2a is not the same as S1.

[@yolo3004]

in problem one, why do we keep the pressures the same for the isentropic process? Couldnt we keep the tempratures the same instead?

[@kylecatman7738]

If it's reversible ONLY does that mean S2 - S1 = Q/T ?? Because Sgen would be zero at that point.

[@engineeringdeciphered]

yes, correct. Sgen is a measure of irreversibility. So a reversible heat transfer would be S2-S1 = Q/T

[@johng3792]

back here helping me review for thermo 2

[@saravmohan9852]

why turbine work output is negative it should be positive since work done by the system is positive while work done on the system for compressor is negative right???

[@engineeringdeciphered]

I like to teach Q+W=deltaH and say everything (Q, W, H) in is positive and everything out is negative. So if using Q+W=dH, work done by the system (out) is negative and work done on the system (in) is positive. If you use Q-W=deltaH then work out is positive and work in is negative.

[@saravmohan9852]

@@engineeringdeciphered now I'm super clear thanks for the instant reply

[@donsupra]

Same problem but 2.5 Mpa and 450°C at inlet, and 60kpa and 100°C at outlet pls 🥲 I can't calculate the value of h2 in the tables